No gates
Merge PDF without signup
Most online PDF mergers gate the tool behind a 'sign up' or 'verify email' wall — not because merging requires server access, but because it's an email-capture play for future marketing. Merging PDFs is one of the simplest operations in the format: concatenate the page trees, deduplicate the cross-reference table, write the trailer. No server needed.
PennyPDF's /merge runs 100% in your browser using a PDF library compiled to WebAssembly. Your files are never uploaded. You can verify this in the browser's Network tab: after selecting files, no outbound request happens until you click download — and that download is a data-URL generated locally.
No signup required. No email. No credit card. The merge is free and unlimited — literally as many files as your browser memory can hold (typically 100MB total on desktop, 25MB on mobile). If you want a signature on the merged PDF or server-side compression after, those are paid features, but the merge itself isn't.
How it works
- 1Open /merge.
- 2Drag-drop your PDFs into the page (or click to browse). Order them by dragging.
- 3Click Merge. Your browser does the work — no upload.
- 4Download the merged PDF. Close the tab. Nothing is retained.
Frequently asked
Really no upload at all?+
Really. The only network traffic during a merge is the initial page load (~200KB) and assets. Open DevTools → Network and filter to XHR/fetch — empty during the operation.
Size limits without signup?+
Up to 25MB total (all files combined) on mobile browsers due to memory constraints, 100MB on desktop. No per-file count limit below those totals.
Can I reorder pages from different PDFs in the merged output?+
/merge concatenates files in the order you drop them. For page-level reordering across sources, use /organize (also client-side, also no signup).
Is the merged PDF bookmarked / outlined?+
Bookmarks from each source PDF are preserved and offset by the page counts. Table of contents in the merged PDF reflects the merged structure.
Will my files get saved server-side after I leave?+
They can't — they were never sent server-side. The whole operation is in your browser's memory and is garbage-collected when you close the tab.
Why PennyPDF
- No subscription. Ever.
- Coins never expire — use them in 5 years.
- Client-side processing for 14 of 22 tools.
- No watermarks at any tier.
- Per-operation pricing, shown before you click.
- Same coins for web + public API.